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首页> 外文期刊>Chemical engineering journal >In-situ implanted carbon nanofilms into lithium titanate with 3D porous structure as fast kinetics anode for high-performance dual-ion battery
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In-situ implanted carbon nanofilms into lithium titanate with 3D porous structure as fast kinetics anode for high-performance dual-ion battery

机译：用3D多孔结构进入钛酸锂的原位植入碳纳米岩作为高性能双离子电池的快速动力学阳极

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摘要

Dual-ion battery (DIB) paring lithium titanate (LTO) anode with graphite cathode is attractive for energy storage applications owing to its merits of environmental friendly, excellent cyclic stability, and good safety. However, the specific capacity of the LTO-DIB is still relatively low (< 50 mAh g(-1)), which ascribe to the mismatching reaction kinetics between the graphite cathode and LTO anode for the low conductivity of LTO. In this work, we propose a strategy of in-situ implanting carbon nanofilms into LTO composite and simultaneous formation of 3D porous structure (LTO@3DC) via combining organic molecule coupling, freeze drying and pyrolysis processes. Consequently, the diffusion coefficient of Li+ ions is dramatically enhanced from similar to 2 x 10(-12)cm(2) s(-1) for pristine LTO to similar to 6 x 10(-12)cm(2) s(-1) for the 3D porous LTO@3DC due to the 3D porous Li+ ions diffusion pathways and conductive carbon skeleton of the LTO@3DC. Further, a DIB configuration combining this fast kinetics LTO@3DC anode and environmental friendly expanded graphite (EG) cathode is constructed (LTO@ 3DC-DIB), which exhibits a high specific capacity (110 mAh g(-1) at 2 C), good rate capability up to 10 C, and long cycling stability with a capacity retention of similar to 100% after 700 cycles under 5 C, among the best cycle performance of the reported DIBs.
机译：双离子电池（DIB）施加锂钛酸锂（LTO）阳极，带石墨阴极对储能应用具有吸引力，由于其环境友好，优异的循环稳定性和良好的安全性。然而，LTO-DIB的比容量仍然相对较低（<50mAh（-1）），其归因于石墨阴极和LTO阳极之间的不匹配反应动力学，用于LTO的低导电性。在这项工作中，通过组合有机分子偶联，冷冻干燥和热解过程，提出了一种原位植入碳纳米岩和同时形成3D多孔结构（LTO @ 3DC）的策略。因此，Li +离子的扩散系数从类似于2×10（-12）cm（2）厘米（2）厘米（-1）的初始增强，用于类似于6×10（-12）cm（2）s（ - 1）对于3D多孔LTO 3DC，由于3D多孔Li +离子扩散途径和LTO @ 3DC的导电碳骨架。此外，构建了组合该快速动力学LTO @ 3DC阳极和环保膨胀石墨（例如）阴极的DIB配置（LTO @ 3DC-DIB），其表现出高特定容量（110mAh（-1）在2℃） ，良好的速率能力高达10℃，循环稳定性长，容量保留在5℃下的700次循环后的容量保持在100％，在报告的DIBS的最佳循环性能下。

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